Hydraulic circular press



Sept. 23, 1941. D. GUP

HYDRAULIC CIRCULAR PRESS 5 Sheets-Sheet 1 Filed July 15, 1940 I r I l%z.'sATToRNEY.

Sept. 23, 1941. I D, GUP 2,256,740

HYDRAULIC CIRCULAR PRESS Filed July 15, 1946 s Sheets-Sheet 2 Sept. 23,1941. GUP 2,256,740

HYDRAULIC C IRCULAR PRES S Filed July 15, 1940 3 Sheets-Sheet 3 PatentedSept. 23, 1941 UNITED STATES PATENT OFFICE HYDRAULIC CIRCULAR PRESSDavid Gup, Rochester, N. Y., assignor to The West Tire Setter Company,Rochester, N. Y., a cor- This invention relates to a hydraulic circularpress, with more particular reference to the type of mechanism employedin compressing rotating bands or rings on projectiles or shells,although applicable to any structure where considerable pressure is tobe applied circularly around a cylindrical surface, and it has for oneof its objects to afford a simple and practical structure whereby theposition of the work relatively to the dies may be shifted easilybetween successive operations so as to eifect pressure successively atdifferent areas longitudinally of the work, in order to prevent excesspressure at a given point of a thin wall section.

In a more particular aspect, the invention has for its purpose toprovide means for readily shifting a cylindrical work piece such as ashell or projectile axially with reference to a series of band or ringcompressing dies or tools surrounding its periphery, permitting the workpiece to be moved quickly in a direction transverse to the direction ofmovement of the dies, between successive operations of the latter.

A further purpose of the invention is to afford a simple and practicalconstruction in a machine of this general character, that enables quickand easy replacement of a die point, where renewal or a different sizedie point is required, Without disturbing the die or other parts of themachine, and permitting the die point to be readily and firmly securedin operative position on the die.

Another object of the invention is to provide a hydraulic circular pressembodying a series of radially operating rams with a simple and improvedspring-return mechanism that permits quick and easy access to thecontrolling springs for adjusting the tension of or replacing aparticular spring, while at the same time locating the spring-controlmeans in such relation to the rams as to effect a smoother and moreefficient movement of the latter.

To these and other ends, the invention consists in the construction andarrangement of parts that will appear clearly from the followingdescription when read in conjunction with the accompanying drawings thenovel features be ing pointed out in the claims following thespecification.

In the drawings:

Fig. 1 is a plan view of a hydraulic circular press illustrating appliedthereto a preferred embodiment of the invention;

Fig. 2' is a view in side elevation;

Fig. 3 is a vertical sectional View on the line 33 of Fig, 1;

Fig. 4 is a diagrammatic sectional view showing the work holder andelevating mechanism therefor in the position with the work at itshighest point;

Fig. 5 is a similar view showing the elevating mechanism adjusted tomove the work holder and work to an intermediate point;

Fig. 6 is a similar view showing the elevating mechanism adjusted withthe work holder and work at their lowest point;

Fig. 7 is an enlarged sectional view of the work holder and elevatingmechanism therefor as applied to a modified arrangement employing anexpanding mandrel for the work piece, and

Fig. 8 is an enlarged detail sectional View through the work and workholder showing a die point in operative or pressing engagement.

Referring more particularly to the drawings, in which like referencenumerals refer to the same parts throughout the several views, Idesignates the base of the stationary frame which also includes pedestalportions 2 and outwardly extending portions 3 carrying upstanding postsl upon which the ring member 5 is secured by means of the bolts 6 thatextend through the posts i and thread into ring member 5.

i designates each of a series of radially movable rams that travelinwardly and outwardly on the table portion 8 of the stationary frame,and include cylinders 9' that cooperate with fixed pistons lil, whichare permanently attached to the aforementioned ring member 5 by means ofthe bolts ll, while l2 designates a fluid pipe leading through eachpiston I'll to the interior of the cylinder 9 for actuating the ramslinwardly when the fluid pressure is admitted to the cylinder, as usualin this class of machinery.

The rams l are radially arranged as shown in Fig. 1, each ram beingprovided with laterally extending horizontal projections or lugs I4 forengagement with a spring-return mechanism that draws the rams back totheir initial position after completion of a compressing operation' whenthe fluid pressure is released. Each spring-return means includes a rodl5 that is attached to the ring member 5 and carries a plate It slidablethereon and engageable with the inner surfaces of the projections I4 onadjacent rams, each spring-return means being effective to actuate tworams on opposite sides thereof to their initial positions.

The plate l6= is actuated by a spring ll surrounding the rod- I5 andheld thereagainst by 3 movement of the same.

means of bolts 26.

die point as.

means of a plate l8 located at the inner end of the rod l5 and retainedthereon by a nut H) or other suitable means adjustable to vary thetension of the spring I? when required.

With this arrangement, the spring-return return means between adjacentrams, the parts are readily accessible to adjust andrvary the i tensionof the springs, or" to replace the'latter' if necessary, Withoutremoving or disturbing a ram as has been necessary inmachines of previous design.

and slidable upon the table portion 8 of the frame, and carries a'depending portion 2|, seeFig. 3, that travels 5 in a guide slot in thetable portion of the frame Each ram 1 is supported to insure propermovement of the ram, .and has attached thereto a bolt 22 which carries agibplate 23 held against the lower surface of the table portion andinsuring proper movement of the ram when pressure is applied. Each ram 1has fixed thereto a die designated generally at 25, see Fig. 1, andattached to the ram by Each die 25 includes a die point seat comprisinga horizontal flat, unbroken surface 21 and a l vertical curved, unbrokensurface 23 which is concentric with the operative surface 29 of the 30fits against the horizontal flat surface 21 of the seat while the rearsurface of the die point is circularly curved and fits snugly againstthe curvedsurface 28 of the seat. The die point is removably held inplace by a bolt 3| extending verti- 1 cally through an opening in thebody portion of the die point and engaging a threaded opening in theflat surface 21 of the seat. With this The bottom surface of the diepoint arrangement, the die point is rigidly held on the die foroperative engagement with the work and is readily accessible for quickremoval where it is desired to change to a die point of a difierent sizeor necessary to replace a die point, such objective being accomplishedWithout removing or disturbing the die or any other portion of the 1mechanism.

Where such a machineis employed for compressing a relatively widerotating band or ring on a shell or projectile, or where the shellincludes'thin sidewalls, it is desirable to apply pressure successivelyat different points endwise 0f the shell to secure rigidly a wide bandand to avoid excessive pressure upon the walls at a given point, and toaccomplish this, the invention includes mechanism for raising orlowering the Work piece between successive pressure operations, thusdividing the pressure operations over different areas. This may beaccomplished. by providing a work holder 33, see Fig. 3, adapted toreceive a shell or projectile 34, upon which is to be compressed arotating band or ring comprising the work piece. The work holder 33 ismounted on a support 36 throughsuitable ball bearings 37 that enable thework holder to be turned manually between successive operations, thesupport 35 being guided vertically in a sleeve 38, constituting part ofa fixed plate 39 that is supported upon the portions 4| of the frame andprovided with slots 42 to receive the depending portions 2| of the ramsas they travel inwardly.

The support 36 carries an anti-friction roller 43 at its lower end whichis engaged by a cam surface 44 of a cam mounted upon a shaft 45 whichextends through the machine to an accessible point at the side thereofand is provided with V in Fig. 4, with the rotating band or ring 35 inits uppermost position. After the first compressing .operationiscompleted, the operator shifts the cam to the position shown in Fig. 5,lowering the workpiece, and can also rotate the work holder if desired,thus bringing the work piece to a slightly lower position for engagementby the die points on the next operation when pressure is applied.Similarly after the second operation, the

work piece may be lowered further by shifting the controlling cam, asshown in Fig. 6, and also rotating the work further, if desired, beforepressure is again applied to operate the dies, thus distributing theareas where pressure is effective over different portions of the workpiece axially thereof. By dividing the effective pressure into a seriesof successive operations, the likelihood of excessive pressure on theshell at any one point is eliminated, and where a, wide band is to beattached or pressure applied over a wide area, it is possible to obtaina firmer and stronger bond than where the total pressure must be appliedat one point and in a single operation.

In some instances, it is desirable to employ an expanding mandrel forsupporting interiorly a thin walled shell or projectile when pressure isapplied for attaching a band or otherwise, and such a mandrel isindicated in Fig. '7, in which 5| is a fluid pressure cylinder ofconventional form for controlling the expanding mandrel, pressure beingapplied to the cylinder through a flexible tube 52. The cylinder 5| is,mounted in a support 53 on suitable ball bearings to permit turning thecylinder and the work piece carried by the mandrel. The support 53 isguided in the fixed sleeve 54, and the cylinder 5| carries at itslowerend a pair of anti-friction rollers 55 arranged on opposite sidesof the fluid pipe 52, the anti-friction rollers 55 being engaged bycamsurfaces 55 on the cams 51 which are mounted on the cam shaft 58 foradjustment by the operator in the same manner as already described.

While the invention has been described with reference to a particularstructural embodiment, it will be understood that it is susceptible ofvarious applications and uses wherever it is desirable to apply pressurecircularly around a cylindrical surface either to force a ring or bandthereagainst or to compress a cylindrical surface against a body locatedinteriorly thereof, and this application is intended to cover anymodifications or changes coming within the purposes of the invention orthe scope of the following claims.

I claim:

1. In a circular press, the combination with a vertically arrange-d ringmember, a series of pistons fixedly attached to said ring member, aseries of radially movable rams, each including a cylinder engaging oneof said pistons and having a die mounted thereon and fiuid means foractuating the cylinder and ram inwardly, of a single spring meanslocated between eachtwo adjacent rams and operatively connected tobothrams on opposite sides thereof for moving the rams outwardly, saidspring means being located in horizontal alinement with the verticalcenters of the rams and accessible between the rams from the top of themachine for adjustment.

2. In a circular press, the combination with'a vertically arranged ringmember, a series of pistons fixedly attached to said ring member, aseries of radially movable rams, each including a cylinder engaging oneof said pistons and having a die mounted thereon and fluid means foractuating the cylinder and ram inwardly, of a single spring-actuatedmember located laterally of and between each two adjacent rams andengageable with the rams on opposite sides thereof to actuate the ramsoutwardly, said spring actuated member being located in horizontalalinement with the vertical centers of the rams and accessible betweenthe rams from the top of the machine for adjustment.

3. In a circular press, the combination with a vertically arranged ringmember, a series of pistons fixedly attached to said ring member, aseries of radially movable rams, each including a cylinder engaging oneof said pistons and having a die mounted thereon and fluid means foractuating the cylinder and ram inwardly, of a single radially arrangedrod between each two adjacent rams and located in horizontal alinementwith the vertical centers of the rams, laterally extending projectionson the rams, and a spring controlled member movable on said rod andengaging the inner surfaces of the projections on the two adjacent ramsto move the rams outwardly, said spring controlled member being waccessible between adjacent rams from the top of the machine foradjustment.

4. In a circular press, the combination with a vertically arranged ringmember, a series of pistons fixedly attached to said ring member, aseries of radially movable rams, each including a cylinder engaging oneof said pistons and having a die mounted thereon and fluid means foractuating the cylinder and ram inwardly, projections extending laterallyfrom opposite sides of each ram, a single radially arranged rodstationarily located between each two adjacent rams in horizontalalinement with the vertical centers of the rams, a plate movable on saidrod and engaging the inner surfaces of the projections on the twoadjacent rams, adjustable retaining means on the inner end of said rod,and a spring located between said adjustable retaining means and saidplate and acting to move the rams outwardly, said adjustable retainingmeans being accessible between adjacent rams from the top of the machinefor adjustment.

5. In a circular press, the combination with a vertically arranged ringmember, a series of pistons fixedly attached to said ring member, aseries of radially movable rams, each including a cylinder engaging oneof said pistons and having a die mounted thereon and fluid means foractuating the cylinder and ram inwardly, of a single spring meanslocated between each two adjacent rams in horizontal alinement with thevertical centers of the rams and operatively connected to the twoadjacent rams for moving them outwardly, said spring means beingaccessible be tween adjacent rams from the top of the machine foradjustment.

6. In a circular press, the combination with a vertically arranged ringmember, a series of pistons fixedly attached to said ring member, aseries of radially movable rams, each including a cylinder engaging oneof said pistons and having a die mounted thereon and fluid means foractuating the cylinder and ram inwardly, of a single radially arrangedrod between each two adjacent rams in horizontal alinement with thevertical centers of the rams, laterally extending projections on therams, and a spring controlled member movable on said rod and engagingthe inner surfaces of the projections on the two adjacent rams to movethe rams outwardly, said spring controlled members beingaccessiblebetween adjacent rams from the top of the machine for adjustment.

7. In a circular press, the combination with a vertically arranged ringmember, a series of pistons fixedly attached to said ring member, aseries of radially movable rams, each including a cylinder engaging onof said pistons and having a die mounted thereon and fluid means foractuating the cylinder and ram inwardly, a single spring controlledmeans located between each two adjacent rams in horizontal alinementwith the vertical centers of the rams and operatively connected to thetwo adjacent rams for moving them outwardly, each die having a seatincluding a horizontal flat surface and a vertical curved surface, aremovable die point having a curved rear surface and positionableagainst said flat and curved surfaces respectively of the die, and anattaching bolt extending vertically through an opening in the die pointand threaded into said seat for holding the die point in position, saidspring controlled means being accessible between adjacent rams from thetop of the machine for adjustment.

8. In a circular press, the combination with a series of radiallymovable rams, each having a die secured thereto and fluid means foractuating the ram inwardly, spring means located between adjacent ramsand operatively connected thereto for moving them outwardly, of avertically movable work holder, a support for the work holder, and a camon which the support rests, said cam being movable to differentpositions to raise or lower the support and maintain the work at anyselected elevation within the limits of the cam.

9. In a circular press, the combination with a series of radiallymovable rams, each having a die secured thereto and fluid means foractuating the ram inwardly, of a vertically movable work holder, asupport on which the work holder is rotatably mounted, and a cam forelevating or lowering the support to maintain the work at any selectedelevation within the limits of the cam.

10. In a circular press, the combination with a series of radiallymovable rams, each having a die secured thereto and fluid means foractuating the ram inwardly, of a vertically movable work holder, asupport on which the work holder is rotatably mounted, a vertical guidefor the support, an anti-friction roller at the lower end of thesupport, and a cam engaging said roller and movable to differentpositions for maintaining the support and work holder at any selectedelevation within the limits of the cam.

11. In a circular press, the combination with a series of radiallymovable rams, each having a die secured thereto and fluid means foractuating the ram inwardly, of a vertically movable work holder, asupport on which the work holder is mounted, and a cam operativelyassociated with the support and movable to raise or lower the vationwithin the limits of the cam; I

12. In a circular press, the combination with a series of radiallymovable rams, each having a die mounted thereon and fluid means foractuating the ram inwardly, spring-controlled means i for moving therams outwardly, each die having a seat including a horizontal fiatsurface and j a vertical curved surface, a removable die point 1 havinga curved rear surface and positionable against said flat and curvedsurfaces of the seat, the portions of the die both above and below saidfiat surface being of greater depth than the die point, said die portionbelow said flat surface having a threaded opening therein, the die pointhaving an opening alinedr with said threaded opening in the die when thecurved surface of the die point is in contact with the curved surface onthe die, and a removable bolt extending vertically through said openingin the die point and having threaded engagement with the opening in 10the die.

7 DAVID GU'P.

